Flexible pipe-covering



P. C. JACOBS.

FLEXIBLE PIPE COVERING.

APPLICATION FILED NOV. 6, I9I9.

1 ,329,409. I Patenfed Feb. 3, 1920.

UNITED STATES PATENT OFFICE.

PHILIP C. JACOBS, OF CHICAGO, ILLINOIS, ASSIGNOR TO H. W. JOHNS-MANVILLECOMPANY, A CORPORATION OF NEW YORK.

FLEXIBLE PIPE-COVERING.

Specification of Letters Patent.

Patented Feb. 3, 1920.

To all whom it may concern:

Be it known that I, PHILIP C. JACOBS, a citizen of the United States ofAmerica, residing at Chicago, county of Cook, State of Illinois, haveinvented certain new and useful Improvements in Flexible Pipe-Coverings,of which the following is a specificat on.

My invention relates to a protective covering for pipes which coveringis of low heat conductivity so as to reduce losses resulting from theconduction of heat to or from the contents of the pipe and is especiallydesigned for use on small pipes which are curved or bent and whichrequire a flexible pipe covering which can be installed or built up uponthem. Pipes of this kind, such as the numerous curved pipes employed inthe cab of a modern locomotive, are also exposed to frequent contactwith the persons operating the locomotive and accordingly it isnecessary that the pipe covering shall be tough and not easily fracturedby blows or friction from passing persons or objects. My invention meetsall these requirements and is simple and economical. The preferred formof structure embodying my invention is illustrated in the accompanyingsheet of drawings, in which Figure 1 is a vertical section through apipe with my invention applied thereto, the parts being broken away;

Fig. 2 is a side View of the same, and

Fig. 3 is an enlarged detail cross section of the material which formsthe basis of my covering.

Throughout the'drawings, like reference characters indicate like parts.

l, is a section of steam pipe usually from an inch to two and a halfinches in diameter, which sizes are best adapted to receive my coveringto advantage. 2, is a strip of special material Wound spirally upon thepipe 1. This special material preferably consists of a strip of asbestoscloth 6, to which a somewhat thicker layer of flexible asbestos felt 8,is fastened by some mineral fireproof cement such as indicated by thethin line or layer 7, in-Fig. 3. As shown, this strip is Wound upon thepipe wlth the felt face 8,

next to the pipe, but of course it may be.

otherwise arranged; 3, is another strip of plain asbestos cloth which iswound upon the covering 2, the spirals of the two strip windlngs runningin opposite directions, as clearly shown in Fig. 2.

To further bind and protect the covering, I next apply a spiral windingof wire 4, the spiral preferably running'in the same direction as thatof strip 2, and then to hold this wire firmly in position and protectthe cloth 3, and harden its exterior surface, I apply a thin coveringofa fireproof cement 5, which dries on exposure to the air and becomeshard, thus protecting the insulation beneath from abrasion, the actionof the elements, and any tendency to unwra This in turnmay be paintedwith a bla aspha ltic paint to make it conform to the finish of anyexposed iron piping in the locomotive cab or other compartment in whichmy invention is being employed. This asphaltic paint also giveswaterproof quality to the outer covering. It may take the place entirelyof the fireproof cement 5, in certain cases. The paint film would be so,thin and be so largely absorbed by the cement covering that I have beenunable to show it clearly in the drawing.

The resultant covering so formed is of I low heat conductivity so thatthe loss of heat from the. steam conveyedthrough the pipe 1, is muchreduced and the operatives are protected from contact with the hot steampipes.

The materials employed in forming the covering are so flexible that theycan be easilyapplied to the most sharply curved pipes in relativelyinaccessible posltions and yet be made to completely cover andthoroughly protect said pipes without leaving any gaps or openingsthrough Various subcominations of the elements above enumerated might beemployed without unnecessarily employing others men-- which heat mayescape.

by a, mineral cement, a covering strip of asbestos cloth spirally woundin the opposite direction, an external binding coil of wire and anexternal facing of fireproof cement 5 in which the wire is embedded. v2. A built-up covering of low heat conductivity for curved steam pipesand the like 'whieh comprises in combination an interior spirailly woundstrip formed of a 10 backing of asbestos cloth with a facing of flexibleasbestos felt cemented to it by silicate of soda cement, and an exterioroppositely wound strip of asbestos cloth held in position by a fireproofcement.

3. A built-up covering of low heat con- 15 ductivity for curved steampipes and the like, which comprises in combination an interior spirallywound strip formed ofa backing of asbestos cloth with a facing ofasbestos felt cemented to it by a fireproof 20 cement and an exteriorwinding of wire held in place by an exterior layer of fireproof cement.I

' PHILIP C. JACOBS.

